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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92882e7af9075aa6bbcc9ae61ddb94dbf7d0fc2b1436ccd24db92d7a8dff9a88' 
  AND token = 'fheQxuacu3+GyX474VUTMtcpjox5WjRSHU9PKK7mgg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}